Why we use Categories in Objective-C

Question

Can anyone explain why we need categories.I need to use categories in my project but don't have an idea how to use category and why we need to use categories.

Can you please elaborate ur question ?? Its pretty vague ... — IronManGill, Feb 06 '13 at 05:42
please check this link : http://stackoverflow.com/questions/7414011/what-is-category-in-objective-c — Sagrian, Feb 06 '13 at 05:49

score 1 · Answer 1 · answered Feb 06 '13 at 05:53

First you need to use google for searching the answer.

You'll get a lot of tutorials, like:

Suppose if you need to add a method to the NSString class for validating the email address, then you need to use category. You can use category to add extra methods to the existing class. Then you can use the object of the existing class, according to the example above, the object of NSString to invoke the added method.

score 0 · Answer 2 · answered Feb 06 '13 at 05:55

0

You'll get better description on :: http://mobile.tutsplus.com/tutorials/iphone/objective-c-categories/

answered Feb 06 '13 at 05:55

Manann Sseth

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Why we use Categories in Objective-C

2 Answers2